McMaster-Carr Supply Company is THE warehouse for prototyping supplies. With over 450,000 products available and almost everything in stock, McMaster-Carr delivers both basic and more exotic materials. From "hammers to hydraulics and levels to lathes," you'll find it through one of their catalogs (for established customers only) or online at www.mcmaster.com. Customer service is a priority, but McMaster's clear descriptions, practical organization, and down-to-business system keep ordering painlessly simple.
 For inventors in search of reasonable prototypes, eMachineShop.com is a resource worth exploring. The site gives you free software to lead you through product development, then invites you to submit your design to them for prototyping. In a month, your prototype will be mailed to you. Prices seem reasonable. One example: 10 custom brass doorknobs cost $150.
eBay is a great resource for inventors, offering product rarities, bargain materials, market trend snapshots, and inspiration. A few inventors have even tried to eBay licensing rights to their inventions. Whether you're in the buying, browsing, or selling mode, check out www.eBay.com.
 American Science & Surplus offers an eclectic mix of items, including dinosaur femurs, Russian military buttons, and white pencils by the dozen. Both products and descriptions have a distinct character, and the site is true to its credo of "discovery, invention, and fun." Visit www.sciplus.com or one of their three Midwest stores for inspiration and amusement.
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